 Plz help about GT4 Rear Diff, Can a different rear diff reduce Turbo boost? |
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 Aug 14, 2008 - 10:23 AM
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Enthusiast  Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%)  |
Hi guys/Gals...
Am facing a problem:( I had an engine swap, from in my 2000 model Rav4 which i fitted with a GT4 ST205 engine. Am getting a low turbo boost:( My turbo is not boosting more than 0.4 bar:( Do u think its because i havent changed the rear diff? Am still running with my 1AZ-FSE rear diff. but can a rear diff reduce the turbo boost?? plz help and thnx again bros:) |
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Aug 14, 2008 - 4:25 PM
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 Enthusiast Joined Dec 15, '02 From Tasmania(Australia) Currently Offline Reputation: 0 (0%) |
you changed the diff? did you just put another one of the same ratio or another one with a different ratio. If its different you will destroy your centre diff (assuming your still awd)
but no changing diff will not change the turbo. -------------------- ST205 Group A Rallye GT-Four, #61 of 77............600hp GT3582r
GRX133 Toyota Mark X 350s  |
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Aug 14, 2008 - 4:28 PM
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 Enthusiast Joined Jun 6, '08 From Hamiltron, Ontario Currently Offline Reputation: 0 (0%) |
Wait, are you saying you put that in a truck?
--------------------  (\__/) (='.'=) This is bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. |
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Aug 14, 2008 - 5:44 PM
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 Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
the diff will not change the amount of boost your running.
-------------------- Former Team 5SFTE pro member ;)
 13.6@108MPH, 5SFTE Powered |
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Aug 14, 2008 - 5:57 PM
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 Enthusiast Joined Jan 29, '07 From Hoyt Lakes, MN Currently Offline Reputation: 11 (100%) |
The diff shouldn't play any role in how much you are boosting. I recommend you get a diff that cna take the power. Check for boost leaks.
-------------------- 98 Celica gt red- totaled deer
94 Celica st black DD (bad weather beater)- totaled deer 95 Celica gt silver- chassis sold 88 Celica All-Trac (Burned to a crisp) 94 Celica gt white (sold) In need of a rust free chassis!!!! |
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Aug 15, 2008 - 3:28 AM
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Enthusiast Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%) |
yes lol but the truck ur talking about weigh 1282 kg where as the celica weight 1380kg;)
QUOTE (Taskbot @ Aug 14, 2008 - 5:28 PM)  Wait, are you saying you put that in a truck? |
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Aug 15, 2008 - 3:32 AM
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Enthusiast Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%) |
QUOTE (Cuts_the_Pilot @ Aug 14, 2008 - 5:25 PM) you changed the diff? did you just put another one of the same ratio or another one with a different ratio. If its different you will destroy your centre diff (assuming your still awd) but no changing diff will not change the turbo. OMG i hope that never happen:( i will change it to the gt4 rear diff soon |
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Aug 16, 2008 - 4:28 PM
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 Enthusiast Joined Feb 10, '06 From Chile Currently Offline Reputation: 0 (0%) |
do a leak test on your intake, its probably becouse you are leaking air, also check your wastegate install , it might be stuck open or something
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Aug 16, 2008 - 7:06 PM
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Enthusiast Joined Jul 29, '07 From Quebec, Canada Currently Offline Reputation: 0 (0%) |
dont forget to ground the pink wire that is on the St205 ECU to remove the intercooler fluid level Check engine protection.
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Aug 17, 2008 - 1:06 PM
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Enthusiast Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%) |
QUOTE (DeathWing @ Aug 16, 2008 - 5:28 PM) do a leak test on your intake, its probably becouse you are leaking air, also check your wastegate install , it might be stuck open or something thnx ill check these:) QUOTE (domyz @ Aug 16, 2008 - 8:06 PM) dont forget to ground the pink wire that is on the St205 ECU to remove the intercooler fluid level Check engine protection. the pink wire? explain plz |
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Aug 17, 2008 - 1:18 PM
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 Enthusiast Joined Apr 2, '07 From Great Western Plateau Currently Offline Reputation: 9 (100%) |
Are you still using ur W2A setup? If not and you havent ground the pink wire then you're running in safe-boost mode, which is around 5psi I think.
You'll need to ground that wire so that the ECU thinks that the pump is still working, thus allowing you to run full boost mode. --------------------  98% completion --- aaRon |
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Aug 17, 2008 - 1:25 PM
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Enthusiast Joined Jan 20, '07 From England Currently Offline Reputation: 10 (100%) |
Have you checked for error codes - the code 54 is the level sensor and will put the engine in limp mode.
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Aug 17, 2008 - 1:30 PM
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Enthusiast Joined Apr 2, '07 From Great Western Plateau Currently Offline Reputation: 9 (100%) |
Just read ur other thread, seems that youve cleared the 54 code already.
http://www.6gc.net/forums/index.php?showto...p;hl=error+code -------------------- 98% completion --- aaRon |
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Aug 18, 2008 - 5:34 AM
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Enthusiast Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%) |
hehe thnx mate! i read ur post there... yea i think ur right, ill have to change that rear diff asap. and concerning the fuel pump i will soon get the 255lph walbro + sard Fuel regulator. will also change the disk clutch to a single plate exedy. my ignition wires are on ship and should reach together with the clutch. but that rear diff, hmm i really need to do something about it. i will try not to run fast for the time being:(
QUOTE (GottaGoTurbo @ Aug 17, 2008 - 1:25 PM) Have you checked for error codes - the code 54 is the level sensor and will put the engine in limp mode. yes bro the codes have been cured. |
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Aug 18, 2008 - 5:44 AM
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Enthusiast Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%) |
QUOTE (GottaGoTurbo @ Aug 17, 2008 - 1:25 PM) Have you checked for error codes - the code 54 is the level sensor and will put the engine in limp mode. yep codes cured...check engine light is off, and ecu is happy:) but am still unhappy:( QUOTE (lubu @ Aug 17, 2008 - 1:18 PM) Are you still using ur W2A setup? If not and you havent ground the pink wire then you're running in safe-boost mode, which is around 5psi I think. You'll need to ground that wire so that the ECU thinks that the pump is still working, thus allowing you to run full boost mode. yes bro still w2a set up. i will change the rear diff on wednesday and check the wastegate. i will also change the fuel pump... |
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Aug 30, 2008 - 12:31 PM
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Enthusiast Joined Jul 14, '08 From Mauritius Currently Offline Reputation: 0 (0%) |
Hi am back again. Well ive managed to install the rear diff of the GT4 and i can feel that my car is running smoother. But the boost problem as expected is still persisting:( There are no error codes and ive changed my fuel pump to a walbro 255 lph and added a sard fuel regulator.
Can anyone tell me how much psi i should be running of fuel pressure???? I think the boost problem is because of some kind of leaks that i cant find:( The wastegate did not stuck open. Am boosting like 6 psi actually:( Does anyone have some kind of tests to check where r the leaks?? plz help |
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